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The NAM intervened in a group of consolidated cases challenging a final rule from the EPA defining its jurisdiction over navigable “Waters of the United States” under the Clean Water Act (CWA). Federal law specifies that, while most lawsuits are filed in federal district courts, some suits must be filed directly in the federal courts of appeals. The statute that provides appellate jurisdiction for certain challenges to EPA regulations does not apply to the WOTUS challenge, though the EPA argued that it did. Prompt resolution of this jurisdictional issue was important so that the WOTUS case could proceed expeditiously through the courts. The NAM’s brief explained that certain legal challenges, such as this issue, belong in the federal district courts and argued that this is not the type of appeal from agency rulemakings under the CWA that is limited to the federal appeals courts by statute. On January 22, 2018, the Supreme Court held that jurisdiction properly belongs in the federal district courts.